FMT_LOAD_MAXIMUM_CURRENT='17e3'The power converter is a two quadrant power converter. The power converter has two DCCT's. One for the regulation of the power converter and one for the software used for measurements. These have a little offset. This offset can add up. Thus allow for a little extra negative current.

power converter load description does not fully handle negative currents.

FMT_LOAD_MINIMUM_CURRENT='-10'Resistance of the circuit including power converter internal resistance and lines to the magnet. This parameter was estimated comparing the voltage the power converter measured and the voltage it displayed as (pre) set voltage on an oscilloskop

FMT_LOAD_RESISTANCE='140e-6'Constant inductance: orignally from calculations: then adjusted by matching the ramp voltage measured by the power converter to the set voltage of the power converter

FMT_LOAD_INDUCTANCE='0.5125e-3'

- Nominal current:
`FMT_LOAD_NOMINAL_CURRENT=13100`

- Start of saturation effect
`FMT_LOAD_THRESHOLD_CURRENT=8864`

- Correction factor applied to
`I/FMT_LOAD_MAXIMUM_CURRENT`

- linear correction:
`FMT_LOAD_INDUCTANCE_CORRECTION_LINEAR='-0.0'`

- quadratic correction:
`FMT_LOAD_INDUCTANCE_CORRECTION_QUADRATIC='-0.2206'`

- cubic correction:
`FMT_LOAD_INDUCTANCE_CORRECTION_CUBIC='0.0195'`

- linear correction:

FMT_LOAD_MAXIMUM_CURRENT='17e3'

# The power converter has two DCCT's. One for the regulation of the power converter

# and one for the software used for measurements. These have a little offset.

# This offset can add up. Thus allow for a little extra negative current.

# power converter load description does not fully handle negative currents.

FMT_LOAD_MINIMUM_CURRENT='-10'

FMT_LOAD_RESISTANCE='140e-6'

# To be measured on the power converter

FMT_LOAD_INDUCTANCE='0.5125e-3'

# The following two parameters are used for the correction factors

# to correct staturation effects.

#

FMT_LOAD_NOMINAL_CURRENT='13100'

# Start of saturation effect

FMT_LOAD_THRESHOLD_CURRENT='8864'

# Correction factor applied to I/FMT_LOAD_MAXIMUM_CURRENT

FMT_LOAD_INDUCTANCE_CORRECTION_LINEAR='-0.0'

FMT_LOAD_INDUCTANCE_CORRECTION_QUADRATIC='-0.2206'

FMT_LOAD_INDUCTANCE_CORRECTION_CUBIC='0.0195'

- inductance (in Henry):
`FMT_LOAD_INDUCTANCE='0.3e-3'`

- resistance (in Ohm) :
`FMT_LOAD_RESISTANCE='400e-6'`

- maximum current of the load
`FMT_LOAD_MAXIMUM_CURRENT='20e3'`

.**Please be aware that the test load may only be powered DC to a current of ~14 kA!**

- So the nominal current of the load was set to:
`FMT_LOAD_NOMINAL_CURRENT='21e3'`

- Similarily the threshold current was set to a value larger than the power converter can provide:
`FMT_LOAD_THRESHOLD_CURRENT='21e3'`

- To avoid any trouble all correction factors were set to 0:
- linear correction:
`FMT_LOAD_INDUCTANCE_CORRECTION_LINEAR='-0.0'`

- quadratic correction:
`FMT_LOAD_INDUCTANCE_CORRECTION_QUADRATIC='-0.0'`

- cubic correction:
`FMT_LOAD_INDUCTANCE_CORRECTION_CUBIC='-0.0'`

- linear correction:

# STF test load (rectangular solenoid)

FMT_LOAD_INDUCTANCE='0.3e-3'

# including power converter setup

FMT_LOAD_RESISTANCE='400e-6'

FMT_LOAD_MAXIMUM_CURRENT='20e3'

FMT_LOAD_NOMINAL_CURRENT='21e3'

FMT_LOAD_THRESHOLD_CURRENT='21e3' FMT_LOAD_INDUCTANCE_CORRECTION_LINEAR='-0.0'

FMT_LOAD_INDUCTANCE_CORRECTION_QUADRATIC='-0.0'

FMT_LOAD_INDUCTANCE_CORRECTION_CUBIC='-0.0'

FMT_LOAD_INDUCTANCE='0.0'The resistance is equal to the internal resistance of the power conververter and its cables. A typical value for the STF cable length is

FMT_LOAD_RESISTANCE='140e-6'The cabling at the PTF is shorter thus a good value of resistance is

FMT_LOAD_RESISTANCE='110e-6'Ohm.

This topic: STF > CurrentMeasurementEquipment > GeraeteDokummentation > PowerConverterDocumentation > PowerConverterLoadParameters

Topic revision: 2017-05-17, AlexanderWarth

Topic revision: 2017-05-17, AlexanderWarth

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